Hi had the same difficulty - see: First Wahoo Workout outdoors, feedback - two observations: I assume that practice is a lot of it, to learn to feel the power rather than respond to the 3s display, and secondly, I found it easier to dose the power when on a steady uphill so that you can use cadence and gearing at a much slower pace to adjust the power.
This was my first attempt, you have to squint quite hard to see a correlation between target and actual…
